ICPL4503 Optoisolator Equivalent & Substitute Parts

Part Overview

The ICPL4503 is a 5000Vrms optoisolator with transistor output, single channel configuration in 8-DIP package. Manufactured by Isocom Components 2004 LTD, this component is classified as obsolete. Due to its discontinued status, identifying parametrically equivalent active alternatives is essential for design continuity and procurement planning. Substitute parts must maintain identical electrical isolation, output characteristics, and physical packaging to ensure direct replacement capability.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Operating Temperature	-55°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the ICPL4503 is determined by strict parametric matching across the following criteria:

Voltage isolation rating: 5000Vrms (mandatory)
Single channel configuration
Transistor output topology
Current transfer ratio range: 19% to 50% @ 16mA
Maximum output voltage: 20V
Output current per channel: 8mA
Operating temperature range: -55°C to 100°C
Physical package: 8-DIP (0.300", 7.62mm)
Through-hole mounting

All identified substitutes meet these electrical and mechanical requirements. Differences in turn-on/turn-off timing and forward voltage are within acceptable tolerance bands for this component category and do not affect substitution validity.

Parameter Comparison

Parameter	ICPL4503	EL4502	EL4502-V	HCPL-4502-020E	HCPL-4503#020	HCPL-4503-020E
Manufacturer	Isocom Components 2004 LTD	Everlight Electronics Co Ltd	Everlight Electronics Co Ltd	Broadcom Limited	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.45V	1.45V	1.5V	1.5V	1.5V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All six substitute parts are parametrically equivalent to the ICPL4503 and support direct replacement in circuit applications. Selection among substitutes should prioritize product status and compliance requirements:

Preferred substitutes (Active status, ROHS3 compliant):

EL4502 (Everlight Electronics Co Ltd): 9063 units in stock
EL4502-V (Everlight Electronics Co Ltd): 803 units in stock
HCPL-4502-020E (Broadcom Limited): 836 units in stock
HCPL-4503-020E (Broadcom Limited): 1037 units in stock

Alternative substitute (Active status, RoHS non-compliant):

HCPL-4503#020 (Broadcom Limited): 840 units in stock. This part is RoHS non-compliant and should be selected only when RoHS compliance is not a design requirement.

The ICPL4503 is obsolete and no longer manufactured. All active substitutes maintain identical electrical performance and physical compatibility, enabling seamless integration into existing designs.

Frequently Asked Questions (FAQ)

Q: Can EL4502 directly replace ICPL4503 in existing designs? A: Yes. EL4502 matches all critical electrical parameters (5000Vrms isolation, 19-50% current transfer ratio, 8mA output current, 20V maximum output voltage) and physical packaging (8-DIP through-hole). No circuit modifications are required.

Q: What is the difference between HCPL-4502-020E and HCPL-4503-020E? A: Both parts are manufactured by Broadcom Limited and are parametrically identical for the ICPL4503 substitution. The primary difference is the base product number designation. Both are ROHS3 compliant and active products.

Q: Why is HCPL-4503#020 listed as an alternative if it is RoHS non-compliant? A: HCPL-4503#020 is parametrically equivalent and electrically compatible with ICPL4503. It is included for applications where RoHS compliance is not mandated. For designs requiring RoHS3 compliance, select HCPL-4503-020E instead.

Q: Are there differences in turn-on/turn-off timing between substitutes? A: Yes. ICPL4503 specifies 800ns typical for both turn-on and turn-off. Everlight EL4502 variants specify 350ns turn-on and 300ns turn-off. Broadcom HCPL-45xx variants specify 200ns turn-on and 600ns turn-off. These timing variations are within acceptable tolerance for this component category and do not affect substitution validity.

Q: What is the forward voltage difference between substitutes? A: ICPL4503 and Everlight EL4502 variants specify 1.45V typical forward voltage. Broadcom HCPL-45xx variants specify 1.5V typical forward voltage. This 0.05V difference is within normal component tolerance and does not impact circuit operation.

Q: Are all substitutes available in the same packaging? A: Yes. All substitutes are supplied in 8-DIP (0.300", 7.62mm) through-hole packages, identical to ICPL4503. Direct PCB mounting without modification is supported.

Q: Which substitute has the highest inventory availability? A: HCPL-4503-020E (Broadcom Limited) has 1037 units in stock, the highest availability among all substitutes.

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